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Dr. Paul Berg (third from left), from the Stanford University Medical School, testifies before the full committee hearing on Tuesday which examined the dangers of cloning and the promise of regenerative medicine, in the Hart Building.

Dr. Paul Berg (third from left), from the Stanford University Medical School,...Dr. Paul Berg (third from left), from the Stanford University Medical School, testifies before the full committee hearing on Tuesday which examined the dangers of cloning and the promise of regenerative medicine, in the Hart Building.MindreMer